mem-cache: Move reference count stats update to blk invalidation

The tags in the cache keep track of the number of references to the
blocks as well as the average number of references between an
insertion and the next invalidation. Previously the stats where
updated only on block insertion and invalidations were ignored. This
changes moves the update of the counters to the block invalidation
function.

Change-Id: Ie7672c13813ec278a65232694024d2e5e17c4612
Reviewed-on: https://gem5-review.googlesource.com/10428
Maintainer: Nikos Nikoleris <nikos.nikoleris@arm.com>
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>

1 files changed, 8 insertions, 3 deletions

diff --git a/src/mem/cache/tags/base.hh b/src/mem/cache/tags/base.hh
index c04329fe9..47bab4323 100644
--- a/src/mem/cache/tags/base.hh
+++ b/src/mem/cache/tags/base.hh
@@ -239,16 +239,21 @@ class BaseTags : public ClockedObject
     }
 
     /**
-     * This function updates the tags when a block is invalidated but
-     * does not invalidate the block itself.
-     * @param blk The block to invalidate.
+     * This function updates the tags when a block is invalidated
+     *
+     * @param blk A valid block to invalidate.
      */
     virtual void invalidate(CacheBlk *blk)
     {
         assert(blk);
         assert(blk->isValid());
+
         tagsInUse--;
         occupancies[blk->srcMasterId]--;
+        totalRefs += blk->refCount;
+        sampledRefs++;
+
+        blk->invalidate();
     }
 
     /**